alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"MALWARE [PTsecurity] REMCOS pkt checker 3"; flow:established, to_client; dsize:25<>200; stream_size:server, <,200; stream_size:server, >,50; stream_size:client, <,1220; stream_size:client, >,200; flowbits:isset, FB180732_2; flowbits:unset, FB180732_2; flowbits:set, FB180732_3; flowbits:noalert; metadata:former_category TROJAN; classtype:trojan-activity; reference:url, github.com/ptresearch/AttackDetection; sid:11003614; rev:7; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, deployment Perimeter, signature_severity Major, created_at 2017_09_11, malware_family Remcos, performance_impact Moderate, updated_at 2017_10_12;)